N. E. G. Hill, Proc. Phys. Soc. (London) 59, 560 (1947); J. G. N. Holmes, Trans. Illum. Soc. (London) 6, 71 (1941); H. J. McNicholas, J. Research Natl. Bur. Standards 17, 955 (1936).
For the effect of background brightness on thresholds for certain red, yellow, green, and white signals, see: N. E. G. Hill, Proc. Phys. Soc. (London) 59, 574 (1947).
Section 220.127.116.11, Annex to Recommendation 1.3.3, reference 1.
F. C. Breckenridge (personal communication).
Technical Committee 1.3.3.: Colours of Signal Lights. Commission Internationale de l’Eclairage, Compte Rendu, 13th Session, Zurich, 1955.
A number of recent investigations have shown that the calculation of luminance according to the C.I.E. system may result in erroneous values for lights containing a wide band of spectral radiation. W. E. K. Middleton and H. S. T. Gottfried, in Illum. Eng.52, 192 (1957), show that the discrepancies between calculated and visual estimates of the intensities of signal lights may be considerable.
For these particular primary filters and these particular restrictions on the proportions of the primaries, the locus of all mixtures having equal illuminance is given on the C.I.E. diagram byy=K(0.910-x)0.9654K+31.4651for “High” illuminance,and byy=K(0.951-x)1.0477K+9.0953for “Low,” whereK=illuminance in mile-candles.These illuminances correspond closely to relative transmission values for actual filters of different purities, according to data supplied by F. C. Breckenridge (personal communication). See also footnote 6.
Table A, Appendix to the Secretariat Report of the Technical Committee 1.3.3, reference 1.
Ellis M. Taft, HM2, U. S. Navy, served skillfully in this capacity; his assistance is gratefully acknowledged.
H. G. Sperling and D. Farnsworth, (1950).
R. W. Pickford, Individual Differences in Colour Vision (Routledge and Kegan Paul Ltd., London, 1951), p. 198.
For example, see Otto Klineberg, Social Psychology (Henry Holt and Company, New York, 1940), p. 204; C. S. Myers, An Introduction to Experimental Psychology (Cambridge University Press, Cambridge, 1911), pp. 29–41; Pickford, reference 14, pp. 31 and 34, cites a 1925 edition of the latter.